Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0e241996be2ba6e47ae57b4832d76d1f041252b37798f65a4c849805d9c02e20:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16